Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfff4da777945126…

MALICIOUS

PDF

76.2 KB Created: 2021-03-08 19:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9c95ef93123728c12eb712e46e48f855 SHA-1: df8bd919b3bfb7286215e4d82cf56e0dfddc800f SHA-256: bfff4da777945126a0b8c68c06c0191b863347ca8775dd8e026fe1da76e7d1e5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains like Weebly, suggesting a link farm or SEO poisoning tactic. The embedded content, though heavily obfuscated, appears to be a lure related to salary information, directing users to malicious URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/strik?utm_term=what+is+news+reporter+salary PDF link annotation
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/2848622.pdfIn PDF document text
    • https://netulomite.weebly.com/uploads/1/3/2/8/132814473/4490147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_600a49b0be9b1.pdfIn PDF document text
    • https://kanevedodusuwa.weebly.com/uploads/1/3/0/8/130814441/e6b1a41c8327.pdfIn PDF document text
    • https://pexekakuxop.weebly.com/uploads/1/3/2/8/132814074/5834447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413454/normal_5fe46a04a3736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5ffa60eb45139.pdfIn PDF document text
    • https://fuxexitir.weebly.com/uploads/1/3/4/0/134098624/watakejiwe.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/galure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_601a5bd177009.pdfIn PDF document text
    • https://murufirekitopu.weebly.com/uploads/1/3/1/8/131856476/xotasaramol_korobebelizeden_juzaluvas_vivakomikaj.pdfIn PDF document text
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/wazizidijuwogatut.pdfIn PDF document text
    • https://muragifenujokuf.weebly.com/uploads/1/3/1/1/131164382/wugovitonuxik_wakasixobos_soditipejofife_sezoxasir.pdfIn PDF document text
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/7387498.pdfIn PDF document text
    • https://judurufag.weebly.com/uploads/1/3/4/6/134688768/b7fc94c9427.pdfIn PDF document text
    • https://voliguxuzewiwa.weebly.com/uploads/1/3/4/7/134762967/lewunodoribelaxo.pdfIn PDF document text
    • https://karegito.weebly.com/uploads/1/3/4/6/134626514/jujon_joputoro_nazusupuvafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3a1e3d-093c-4c9b-b91c-748d838197b5/how_to_apply_oracal_651_permanent_vinyl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3f59aa-d563-4734-a5d9-30575baf83ec/attack_on_titan_character_season_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c364d8-872a-4b90-9d60-b59dbabea79b/59943117086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fadf45ed-cfad-4f2a-b52d-23cd3cacc1c9/how_to_switch_off_ipod_nano_6th_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56259d58-ed00-4764-9cb3-b48eb0ece65c/tatosonudavatobeje.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 5116 bytes
SHA-256: 602f8d0655576ec92707aa790ce4c22bb3f0630bc629842cffaf4d86861b1c2c
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 10456 bytes
SHA-256: 85d07fc9c1efad59e3e4cfbfe5528cf70fd519388934337368b4540a33f319f7